WO2011118104A1 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
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Definitions
- the present invention relates to a semiconductor device and a manufacturing method thereof, and more particularly to a semiconductor device having a substrate made of silicon carbide having a single crystal structure and a manufacturing method thereof.
- Patent Document 1 discloses a semiconductor device having a substrate made of single crystal silicon carbide. According to this publication, in order to manufacture this device, a silicon carbide epitaxial layer is formed on the main surface of a semiconductor substrate made of single crystal silicon carbide, and a surface channel layer is arranged on the silicon carbide epitaxial layer. A gate electrode is formed on the surface of the surface channel layer via a gate insulating film. As a method for forming the gate insulating film, an oxidation process with heating is exemplified.
- the resistivity of the substrate may be greatly increased in the manufacturing process of the semiconductor device as described above.
- the on-resistance of the semiconductor device also increases when the substrate constitutes at least part of the current path of the semiconductor device.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a semiconductor device including a substrate made of silicon carbide having a single crystal structure and having a low on-resistance. And a manufacturing method thereof.
- the semiconductor device of the present invention is a semiconductor device having a current path, and has a semiconductor layer and a substrate.
- the semiconductor layer constitutes at least a part of the current path and is made of silicon carbide.
- the substrate has a first surface that supports the semiconductor layer and a second surface that faces the first surface.
- the substrate is made of silicon carbide having a 4H type single crystal structure.
- the substrate has physical properties such that the ratio of the peak intensity near the wavelength of 500 nm to the peak intensity near the wavelength of 390 nm is 0.1 or less in the photoluminescence measurement.
- the limitation that the ratio is 0.1 or less does not exclude the case where the ratio is zero.
- One of the causes of the increase in resistivity of a single crystal substrate made of silicon carbide having a 4H type single crystal structure is a defect identified by the presence of a peak near a wavelength of 500 nm in photoluminescence measurement. Found that this is because of progress.
- the semiconductor device of the present invention is based on this finding, and by using a substrate with few defects as described above, an increase in the resistivity of the substrate is suppressed, and as a result, the on-resistance of the semiconductor device is low. It will be lost.
- the substrate has the physical properties described above on the second surface. As a result, it is possible to prevent the defect from progressing from the second surface of the substrate to the inside thereof.
- the semiconductor device further includes an insulating film on the semiconductor layer. Accordingly, a region electrically insulated from the semiconductor layer can be provided.
- the insulating film is made of an oxide of the material of the semiconductor layer.
- the insulating film can be formed using the semiconductor layer.
- the insulating film is a thermal oxide film.
- the insulating film can be formed by a heating process. Further, according to the present invention, an increase in the resistivity of the substrate in this heating process is prevented.
- the substrate forms part of the current path.
- the substrate in which the increase in resistivity is suppressed is made part of the current path, so the on-resistance of the semiconductor device is reduced.
- the first surface has an off angle of 50 ° to 65 ° with respect to the ⁇ 0001 ⁇ plane. Accordingly, channel mobility in the semiconductor device can be increased.
- the off azimuth of the off angle may be within a range of ⁇ 5 ° or less with respect to the ⁇ 11-20> direction. Accordingly, channel mobility in the semiconductor device can be increased.
- the off orientation of the off angle may be within a range of ⁇ 5 ° or less with respect to the ⁇ 01-10> direction.
- the first surface has an off angle of ⁇ 3 ° to + 5 ° with respect to the ⁇ 03-38 ⁇ plane in the ⁇ 01-10> direction, and more preferably, the first surface is It has an off angle of ⁇ 3 ° to + 5 ° with respect to the (0-33-8) plane in the ⁇ 01-10> direction. Accordingly, channel mobility in the semiconductor device can be increased.
- the (0001) plane of hexagonal single crystal silicon carbide is defined as the silicon plane
- the (000-1) plane is defined as the carbon plane.
- the off angle with respect to the ⁇ 03-38 ⁇ plane in the ⁇ 01-10> direction is an orthogonal projection of the normal of the first surface to the plane extending in the ⁇ 01-10> direction and the ⁇ 0001> direction
- ⁇ 03-38 ⁇ is an angle formed with the normal of the plane, and its sign is positive when the orthographic projection approaches parallel to the ⁇ 01-10> direction, and the orthographic projection is in the ⁇ 0001> direction.
- the case of approaching parallel is negative.
- the off angle with respect to the (0-33-8) plane in the ⁇ 01-10> direction is an orthogonal projection of the normal of the first surface to the plane extending in the ⁇ 01-10> direction and the ⁇ 0001> direction.
- (0-33-8) plane normal, and its sign is positive when the orthographic projection approaches parallel to the ⁇ 01-10> direction, and the orthographic projection is ⁇
- the case of approaching parallel to the 0001> direction is negative.
- the first surface having an off angle with respect to the (0-33-8) plane in the ⁇ 01-10> direction is not less than ⁇ 3 ° and not more than + 5 ° is the above condition in which the first surface is a silicon carbide crystal. It means that the surface on the carbon surface side satisfies the above.
- the (0-33-8) plane includes an equivalent carbon surface side surface whose expression differs depending on the setting of an axis for defining the crystal surface, and does not include a silicon surface side surface.
- the ⁇ 03-38 ⁇ plane includes both the (0-33-8) plane that is the plane on the carbon plane side and the (03-38) plane that is the plane on the silicon plane side.
- the semiconductor layer In a semiconductor device having a semiconductor layer epitaxially formed on a first surface close to the ⁇ 03-38 ⁇ plane and an insulating film (for example, a gate oxide film) formed on the surface of the semiconductor layer, the semiconductor layer The carrier mobility in the semiconductor layer near the interface between the insulating film and the insulating film is improved.
- the first surface of the substrate is a surface close to the (0-33-8) surface on the carbon surface side of the ⁇ 03-38 ⁇ surface, the carrier mobility is further improved.
- the semiconductor device further includes a base layer that supports the substrate and is made of silicon carbide.
- the base layer can support the substrate.
- the method for manufacturing a semiconductor device is a method for manufacturing a semiconductor device having a current path, and includes the following steps.
- a substrate made of silicon carbide having a first surface and a second surface opposite to the first surface and having a 4H type single crystal structure is prepared.
- a processing damage layer is formed on the second surface.
- the processing damage layer on the second surface is removed.
- a semiconductor layer that forms at least part of the current path and is made of silicon carbide is formed on the first surface.
- the substrate and the semiconductor layer are heated.
- One of the causes of the increase in resistivity of a single crystal substrate made of silicon carbide having a 4H-type single crystal structure is that the semiconductor layer of the first and second surfaces of the substrate is a semiconductor layer. It has been found that defects are developed at a high temperature from the processing damage layer on the second surface opposite to the formed first surface.
- the manufacturing method of the semiconductor device of the present invention is based on this finding, and the above-described defect progress is suppressed by removing the processing damage layer on the second surface. This suppresses an increase in the resistivity of the substrate, and as a result, the on-resistance of the semiconductor device is lowered.
- the step of heating the substrate and the semiconductor device includes a step of forming an insulating film on the semiconductor layer by thermally oxidizing the surface of the semiconductor layer.
- an insulating film can be formed on the semiconductor layer by thermal oxidation of the semiconductor layer.
- the step of preparing the substrate includes the following steps.
- An ingot made of silicon carbide having a 4H type single crystal structure is prepared.
- a second surface is formed by slicing the ingot.
- the first surface of the substrate is polished before the step of forming the semiconductor layer.
- a semiconductor layer can be formed on a flatter surface.
- a base layer made of silicon carbide is formed on the second surface of the substrate after the step of removing the processing damage layer and before the step of forming the semiconductor layer.
- the base layer can support the substrate.
- the step of removing the processing damage layer for example, at least one of a method by molten KOH etching, a method by dry etching, a method by sublimating the processing damage layer, and a method by polishing can be used.
- a semiconductor device including a substrate made of silicon carbide having a single crystal structure and having a low on-resistance, and a method for manufacturing the same can be provided. .
- FIG. 1 is a cross sectional view schematically showing a configuration of a semiconductor device in a first embodiment. It is a figure which shows the Example of the photo-luminescence measurement in the back surface of the board
- 2 is a flowchart for schematically explaining a method of manufacturing the semiconductor device of FIG. 1.
- FIG. 2 is a perspective view schematically showing a first step of the method for manufacturing the semiconductor device of FIG. 1.
- FIG. 6 is a cross-sectional view schematically showing a second step of the method for manufacturing the semiconductor device in FIG. 1.
- FIG. 6 is a cross-sectional view schematically showing a third step of the method for manufacturing the semiconductor device in FIG. 1.
- FIG. 1 is a cross sectional view schematically showing a configuration of a semiconductor device in a first embodiment. It is a figure which shows the Example of the photo-luminescence measurement in the back surface of the board
- FIG. 8 is a cross-sectional view schematically showing a fourth step of the method for manufacturing the semiconductor device in FIG. 1.
- FIG. 7 is a cross-sectional view schematically showing a fifth step of the method for manufacturing the semiconductor device in FIG. 1.
- FIG. 9 is a cross sectional view schematically showing a sixth step of the method for manufacturing the semiconductor device of FIG. 1.
- FIG. 10 is a cross sectional view schematically showing a seventh step of the method for manufacturing the semiconductor device of FIG. 1.
- FIG. 10 is a cross sectional view schematically showing an eighth step of the method for manufacturing the semiconductor device of FIG. 1. It is sectional drawing which shows roughly 1 process of the manufacturing method of the semiconductor device of a comparative example.
- FIG. 10 is a cross-sectional view schematically showing a fourth step of the method for manufacturing the semiconductor device in FIG. 1.
- FIG. 7 is a cross-sectional view schematically showing a fifth step of the method for manufacturing the semiconductor device in FIG. 1.
- FIG. 9 is a cross sectional
- FIG. 10 is a cross sectional view schematically showing a configuration of a composite substrate used for manufacturing a semiconductor device in a second embodiment.
- 14 is a flowchart for schematically explaining a method of manufacturing the composite substrate shown in FIG. 13.
- 11 is a flowchart for schematically illustrating a method for manufacturing a composite substrate used for manufacturing a semiconductor device in a third embodiment.
- FIG. 10 is a cross sectional view schematically showing a first step of a method for manufacturing the composite substrate used for manufacturing the semiconductor device in the third embodiment.
- FIG. 11 is a cross sectional view schematically showing a second step of the method for manufacturing the silicon carbide substrate used for manufacturing the semiconductor device in the third embodiment.
- FIG. 11 is a cross sectional view schematically showing a third step of the method for manufacturing the silicon carbide substrate used for manufacturing the semiconductor device in the third embodiment.
- FIG. 10 is a cross sectional view schematically showing a configuration of a composite substrate used for manufacturing a semiconductor device in a fourth embodiment.
- FIG. 10 is a cross sectional view schematically showing a configuration of a composite substrate used for manufacturing a semiconductor device in a fifth embodiment. It is a flowchart for demonstrating schematically the manufacturing method of the composite substrate shown in FIG.
- FIG. 10 is a cross sectional view schematically showing a configuration of a composite substrate used for manufacturing a semiconductor device in a sixth embodiment. It is a flowchart for demonstrating schematically the manufacturing method of the composite substrate shown in FIG. FIG.
- FIG. 24 is a cross sectional view schematically showing a configuration of a composite substrate used for manufacturing a semiconductor device in a seventh embodiment. It is a flowchart for demonstrating schematically the manufacturing method of the composite substrate shown in FIG.
- FIG. 25 is a cross-sectional view schematically showing one step of the method for manufacturing the composite substrate shown in FIG. 24.
- a semiconductor device 1 in the present embodiment has a current path in a vertical direction, and is specifically a vertical DiMOSFET (Double Implanted MOSFET).
- the semiconductor device 1 includes a substrate 2, a buffer layer 21, a breakdown voltage holding layer 22, a p region 23, an n + region 24, a p + region 25, an oxide film 26, a source electrode 11 and an upper source electrode 27, a gate electrode 10 and a substrate 2.
- the drain electrode 12 is provided on the back surface side.
- Buffer layer 21, breakdown voltage holding layer 22, p region 23, n + region 24, and p + region 25 constitute a semiconductor layer made of silicon carbide on substrate 2, and this semiconductor layer is an upper source electrode
- the current path of the semiconductor device 1 is configured between the 27 and the drain electrode 12.
- Substrate 2 is made of silicon carbide (SiC) having a 4H-type single crystal structure, and includes n-type impurities (impurities whose conductivity type of substrate 2 is n-type, for example, nitrogen). Has conductivity type.
- the substrate 2 has a main surface 2A (first surface) and a back surface 2B (second surface) facing the main surface 2A.
- the substrate 2 has a physical property in which the ratio of the peak intensity in the vicinity of the wavelength of 500 nm to the peak intensity in the vicinity of the wavelength of 390 nm is 0.1 or less in the photoluminescence measurement, preferably the physical property in which this ratio is 0.01 or less. More preferably, it has the physical property that this ratio is substantially zero.
- an excitation laser He—Cd laser
- a diffraction grating type spectrometer having a wavelength resolution of 1 nm is used as a measurement apparatus.
- the drain electrode 12 is first removed to expose the back surface 2B.
- the laser beam converged by the lens is irradiated to the back surface 2B.
- the photoluminescence light generated from the back surface 2B enters the spectroscope via a filter or the like as necessary.
- a spectrum of photoluminescence light is obtained by detecting light wavelength-dispersed by a spectroscope with a CCD or the like. From this spectrum, the above-described peak intensity ratio is calculated.
- the spectrum indicated by the solid line is the measurement result of the example of the present embodiment
- the spectrum indicated by the alternate long and short dash line is the measurement result of the comparative example.
- the spectrum of the comparative example had a peak Q1 near the wavelength of 390 nm and a peak Q2 near the wavelength of 500 nm.
- the spectrum of the example had a strong peak P1 near the wavelength of 390 nm, but did not have a clear peak near the wavelength of 500 nm. Therefore, the peak intensity ratio was substantially 0 in the examples and about 1 in the comparative examples.
- the reason why the substrate 2 having the back surface 2B that gives a peak intensity ratio of substantially 0 in the above embodiment is used is as follows.
- the inventors of the present invention have one of the causes of the increase in resistivity of the substrate 2 made of SiC having a 4H-type single crystal structure due to stacking faults specified by the presence of a peak near a wavelength of 500 nm in the photoluminescence measurement.
- defects in the processing damage layer become stacking faults and progress in the manufacturing process of the semiconductor device 1, particularly in the process with heating. Therefore, the present inventors use the substrate 2 with few defects identified as described above, that is, by preparing the substrate 2 having a small value as the ratio of the peak intensities, in the manufacturing process of the semiconductor device 1.
- the peak near 390 nm is used as the denominator of the ratio of peak intensities is that the peak near 390 nm is an interband light emission of SiC having an ideal 4H-type single crystal structure. This is because the corresponding peak in the vicinity of 500 nm can be normalized.
- the above ratio is substantially 0, and such a form is most preferable. However, this ratio does not necessarily have to be substantially 0. If it is 0.1 or less, the effect is obtained.
- Buffer layer 21 is made of silicon carbide, and is formed on main surface 2 ⁇ / b> A of substrate 2.
- Buffer layer 21 has n-type conductivity and has a thickness of 0.5 ⁇ m, for example. Further, the concentration of the n-type impurity in the buffer layer 21 can be set to 5 ⁇ 10 17 cm ⁇ 3 , for example.
- a breakdown voltage holding layer 22 is formed on the buffer layer 21.
- the breakdown voltage holding layer 22 is made of silicon carbide of n-type conductivity, and has a thickness of 10 ⁇ m, for example. Further, as the concentration of the n-type impurity in the breakdown voltage holding layer 22, for example, a value of 5 ⁇ 10 15 cm ⁇ 3 can be used.
- p regions 23 having a p-type conductivity are formed at intervals.
- n + region 24 is formed in a region including the main surface of p region 23.
- a p + region 25 is formed at a position adjacent to the n + region 24.
- An oxide film 26 is formed so as to extend up to. As the thickness of the oxide film 26, for example, a value of 40 nm can be used.
- a gate electrode 10 is formed on the oxide film 26.
- the source electrode 11 is formed so as to be in contact with the n + region 24 and the p + region 25.
- An upper source electrode 27 is formed on the source electrode 11.
- the drain electrode 12 is formed on the main surface (back surface 2 ⁇ / b> B) opposite to the main surface on which the buffer layer 21 is formed.
- the maximum value of the nitrogen atom concentration in a region within 10 nm from the interface between the oxide film 26 and the n + region 24, p + region 25, p region 23, and breakdown voltage holding layer 22 as a semiconductor layer is 1 ⁇ 10 It is 21 cm ⁇ 3 or more.
- the mobility of the channel region under the oxide film 26 (the portion in contact with the oxide film 26 and the portion of the p region 23 between the n + region 24 and the breakdown voltage holding layer 22) can be improved. .
- the main surface 2A on the buffer layer 21 side of the substrate 2 has an off angle of preferably 50 ° or more and 65 ° or less with respect to the plane orientation ⁇ 0001 ⁇ , and more preferably an off angle of about 53 °.
- the off azimuth of the off angle may be within a range of ⁇ 5 ° or less with respect to the ⁇ 11-20> direction.
- the off azimuth of the off angle may be within a range of ⁇ 5 ° or less with respect to the ⁇ 01-10> direction.
- main surface 2A has an off angle of ⁇ 3 ° to + 5 ° with respect to the ⁇ 03-38 ⁇ plane in the ⁇ 01-10> direction, and more preferably, main surface 2A is ⁇ 01 It has an off angle of not less than ⁇ 3 ° and not more than + 5 ° with respect to the (0-33-8) plane in the ⁇ 10> direction.
- the main surface opposite to the substrate 2 of the p region 23 formed by epitaxial growth and impurity implantation on the main surface 2A is substantially (0-33-8) plane. As a result, carrier mobility (channel mobility) in the channel region can be particularly increased.
- silicon carbide substrate preparation step S10 (FIG. 3) is performed.
- an n-type conductivity type silicon carbide substrate having a plane orientation (0-33-8) plane as main surface 2A is prepared as substrate 2.
- Such a substrate can be obtained by, for example, a method of cutting a substrate from an ingot (raw material crystal) having a (0001) plane as a main surface so that the (0-33-8) plane is exposed as the main surface 2A.
- the substrate 2 for example, a substrate having a conductivity type of n type and a substrate resistance of 0.02 ⁇ cm may be used. Specifically, the following steps shown in FIGS. 4 to 7 are performed.
- an ingot 2Z made of SiC having a 4H type single crystal structure is prepared.
- the ingot 2Z is sliced as indicated by a broken line in the figure.
- substrate 2 having main surface 2A and back surface 2B is cut out by this slicing process. Due to the mechanical stress of the slicing process, a processing damage layer 2p is formed on each of the main surface 2A and the back surface 2B.
- the processing damage layer 2p is a layer having a distortion of the crystal structure, and has a thickness of about 10 ⁇ m, for example.
- the processing damage layer 2p on the back surface 2B is removed.
- at least one of a method by molten KOH etching, a method by dry etching, a method by thermal etching, and a method by polishing can be used.
- the thermal etching is a method of removing SiC mainly by high-temperature heating, specifically, a method of sublimating SiC, and removing SiC by exposing SiC to a specific atmosphere at a high temperature. Any of the methods can be used.
- a hydrogen atmosphere for example, a chlorine atmosphere, or a hydrogen chloride atmosphere can be used.
- a method of forming an oxide layer by oxidizing the surface of the back surface 2B and removing the oxide layer by wet etching can be used.
- a method of forming a carbonized layer by carbonizing the surface of the back surface 2B and removing the carbonized layer can also be used.
- the processing damage layer 2p is formed on the back surface 2B by a chemical method instead of a mechanical method and a physical method. Removed. Further, when the processing damage layer 2p is removed with a mechanical method, a condition is used so that the mechanical damage becomes as small as possible. Specifically, CMP (Chemical Mechanical Polishing) is preferable to simple mechanical polishing, and when simple mechanical polishing is performed, an abrasive having a particle size of about 3 ⁇ m or less is preferably used. .
- CMP Chemical Mechanical Polishing
- lapping is performed on main surface 2A.
- This lapping is a relatively rough polishing process, and an abrasive having a particle size preferably exceeding 3 ⁇ m is used.
- mechanical polishing using an abrasive having a smaller particle diameter is performed on main surface 2A.
- This particle size is preferably 0.5 ⁇ m or more and 3 ⁇ m or less.
- CMP is performed on main surface 2A. Thereby, the processing damage layer 2p on the main surface 2A is roughly removed.
- the main surface 2A was subjected to CMP through lapping and mechanical polishing. That is, polishing was performed such that the polishing rate was gradually reduced.
- stepwise polishing is not necessarily required for the back surface 2B, and a process for removing the processing damage layer 2p may be performed. This difference is because the process for the main surface 2A is mainly aimed at flattening the main surface 2A, while the process for the back surface 2B is mainly intended to remove the processing damage layer 2p on the back surface 2B. is there. Further, in FIG.
- the main surface 2A may need to be polished so as to be flattened, and processing damage may be reintroduced by lapping, so that the polishing rate must be gradually reduced. is there.
- the substrate 2 used for the manufacturing process of the semiconductor device 1 is prepared.
- the substrate 2 prepared in this way has only a slight processing damage layer 2p on the back surface 2B, or does not have the processing damage layer 2p on the back surface 2B.
- epitaxial layer forming step S20 (FIG. 3) is performed. Specifically, buffer layer 21 is formed on main surface 2 ⁇ / b> A of substrate 2. As the buffer layer, an epitaxial layer made of silicon carbide of n-type conductivity, for example, having a thickness of 0.5 ⁇ m is formed. The impurity concentration in the buffer layer 21 is, for example, 5 ⁇ 10 17 cm ⁇ 3 . Then, a breakdown voltage holding layer 22 is formed on the buffer layer 21 as shown in FIG. As the breakdown voltage holding layer 22, a layer made of silicon carbide of n-type conductivity is formed by an epitaxial growth method. The thickness of the breakdown voltage holding layer 22 is, for example, 10 ⁇ m. The concentration of the n-type conductive impurity in the breakdown voltage holding layer 22 is, for example, 5 ⁇ 10 15 cm ⁇ 3 .
- an injection step S30 (FIG. 3) is performed. Specifically, by using an oxide film formed by photolithography and etching as a mask, an impurity having a conductivity type of p type (for example, aluminum (Al)) is implanted into the breakdown voltage holding layer 22, thereby forming the p region 23. Form. Further, after removing the used oxide film, an oxide film having a new pattern is formed again by photolithography and etching. Then, using the oxide film as a mask, an n-type impurity is implanted into a predetermined region, thereby forming an n + region 24. As this n-type impurity, for example, phosphorus (P) can be used. Further, the p + region 25 is formed by implanting an impurity having a p-type conductivity by a similar method.
- p type for example, aluminum (Al)
- activation annealing is performed.
- this activation annealing treatment for example, argon gas is used as an atmospheric gas, and conditions such as a heating temperature of 1700 ° C. and a heating time of 30 minutes can be used.
- gate insulating film formation step S40 (FIG. 3) is performed. Specifically, an oxide film 26 (insulating film) is formed so as to cover the breakdown voltage holding layer 22, the p region 23, the n + region 24, and the p + region 25.
- the oxide film 26 is a thermal oxide film formed by dry oxidation (thermal oxidation) of the semiconductor layer.
- the oxide film 26 is made of an oxide of the material of the semiconductor layer. This dry oxidation includes a heating step, and this heating step has, for example, conditions of a heating temperature of 1200 ° C. and a heating time of 120 minutes.
- a nitrogen annealing step S50 (FIG. 3) is performed. Specifically, the annealing process is performed using nitrogen monoxide (NO) as the atmosphere gas. As temperature conditions for the annealing treatment, for example, the heating temperature is 1100 ° C. and the heating time is 120 minutes. As a result, nitrogen atoms are introduced near the interface between the oxide film 26 and the underlying breakdown voltage holding layer 22, p region 23, n + region 24, and p + region 25. Further, after the annealing step using nitrogen monoxide as an atmospheric gas, annealing using nitrogen monoxide as an atmospheric gas, annealing using argon (Ar) gas which is an inert gas may be performed. Specifically, argon gas may be used as the atmosphere gas, and the heating temperature may be 1100 ° C. and the heating time may be 60 minutes.
- electrode forming step S60 (FIG. 3) is performed. Specifically, a resist film having a pattern is formed on the oxide film 26 by using a photolithography method. Then, using the resist film as a mask, portions of the oxide film located on the n + region 24 and the p + region 25 are removed by etching. Thereafter, on the resist film, in the opening formed in the oxide film 26, the region in contact with the n + region 24 and the p + region 25, and the main surface opposite to the buffer layer 21 of the substrate 2, A conductor film such as metal is formed. Thereafter, by removing the resist film, the conductor film located on the resist film is removed (lifted off).
- nickel (Ni) can be used as the conductor.
- the source electrode 11 and the drain electrode 12 can be obtained.
- Ar argon
- the gate electrode 10 (see FIG. 1) is further formed on the oxide film 26 that acts as a gate insulating film.
- the following method can be used. For example, a resist film having an opening pattern located in a region on the oxide film 26 is formed in advance, and a conductor film constituting the gate electrode is formed so as to cover the entire surface of the resist film. Then, by removing the resist film, the conductor film other than the portion of the conductor film to be the gate electrode is removed (lifted off). As a result, the gate electrode 10 is formed as shown in FIG. In this way, the semiconductor device 1 as shown in FIG. 1 can be obtained.
- FIG. 12 a substrate having a processing damage layer 2p on the back surface 2B is prepared, and the same steps as in FIGS. 8 to 11 are performed using this substrate.
- These steps include a step involving a plurality of heating, and in this heating step, the stacking fault is likely to progress as indicated by an arrow DV (FIG. 12).
- this progressing direction is a direction perpendicular to the ⁇ 0001> direction, for example, the ⁇ 11-20> direction. Therefore, the larger the off angle with respect to the ⁇ 0001 ⁇ plane, the easier the stacking faults propagate in the substrate 2.
- the resistivity of the substrate 2 increases.
- the change in sheet resistance of the substrate 2 in the example of the present embodiment will be described.
- the sheet resistance was 520 m ⁇ / ⁇ .
- the sheet resistance hardly changed and was 520 m ⁇ / ⁇ .
- the oxide film 26 was formed under the heat treatment conditions of a temperature of 1200 ° C. and a time of 120 minutes (FIG. 10)
- the sheet resistance hardly changed and was 520 m ⁇ / ⁇ . That is, in this embodiment, the sheet resistance of the substrate 2 hardly changed during the manufacturing process of the semiconductor device 1.
- the processing damage layer 2p on the back surface 2B is not removed. That is, a substrate having a processing damage layer 2p on the back surface 2B is first prepared. At this time, the sheet resistance was 500 m ⁇ / ⁇ . At the stage where the withstand voltage holding layer 22 was formed (corresponding to FIG. 8), the sheet resistance slightly increased to 530 m ⁇ / ⁇ . At the stage where the oxide film 26 was formed under the heat treatment conditions of a temperature of 1200 ° C. and a time of 120 minutes (corresponding to FIG. 10), the sheet resistance rapidly increased to 900 m ⁇ / ⁇ .
- the sheet resistance of the substrate 2 increased in the manufacturing process of the semiconductor device 1, and increased rapidly after a particularly strong heat treatment. Further, from the measurement result of the sheet resistance obtained by removing the back side of the substrate by 100 ⁇ m, the resistivity of the removed portion is about 1.3 times higher than the resistivity of the remaining portion. Had. That is, the substrate of the comparative example had a particularly high resistivity in the vicinity of the back surface.
- the temperature of the heat treatment for greatly increasing the resistivity of the substrate having the processing damage layer 2p on the back surface 2B as described above is not limited to 1200 ° C.
- the large increase in resistivity as described above can be caused by heat treatment at 1000 to 1200 ° C., for example.
- an increase in resistivity of the substrate 2 in the manufacturing process of the semiconductor device 1 can be suppressed, and in particular, an increase in resistivity near the back surface 2B can be suppressed. .
- the semiconductor device 1 of the present embodiment is considered to have a low on-resistance.
- the semiconductor device in the present embodiment has composite substrate 2Xa instead of substrate 2 of semiconductor device 1 (FIG. 1) in the first embodiment.
- Composite substrate 2Xa includes base layer 110 made of SiC and substrate 120 arranged on one main surface 110A of base layer 110.
- the substrate 120 has the same configuration as that of the substrate 2 (FIG. 7: Embodiment 1), and includes a main surface 120A corresponding to the main surface 2A of the substrate 2 and a back surface 120B corresponding to the back surface of the substrate 2.
- the drain electrode 12 is provided on the back surface 120B with the base layer 110 interposed therebetween.
- the base layer 110 and the substrate 120 are made of different crystals.
- the defect density of the substrate 120 is smaller than the defect density of the base layer 110.
- the presence of the interface between the base layer 110 and the substrate 120 suppresses the propagation of defects in the base layer 110 into the substrate 120.
- the base layer 110 and the substrate 120 may be directly bonded or may be bonded via an intermediate layer.
- High-quality SiC single crystal is difficult to increase in diameter.
- a substrate having a uniform shape and size is required. Therefore, even when a high-quality SiC single crystal (for example, a silicon carbide single crystal having a low defect density) is obtained, a region that cannot be processed into a predetermined shape by cutting or the like may not be used effectively.
- the composite substrate 2Xa constituting the semiconductor device of the present embodiment includes a base layer 110 made of SiC and a substrate 120 made of single crystal SiC and disposed on the base layer 110.
- the defect density of 120 is smaller than the defect density of the base layer 110. Therefore, the base substrate 110 made of SiC crystal having a high defect density and low quality is processed into the above-mentioned predetermined shape and size to form the base layer 110.
- An SiC single crystal that is not realized can be arranged as the substrate 120. Since the composite substrate 2Xa obtained in this way is unified in a predetermined shape and size, the manufacturing of the semiconductor device can be made efficient.
- the composite substrate 2Xa obtained in this way can manufacture the semiconductor device 1 using the high-quality substrate 120, the SiC single crystal can be effectively used. As a result, according to the semiconductor device of the present invention, a semiconductor device capable of reducing the manufacturing cost can be provided.
- the half width of the X-ray rocking curve of the substrate 120 may be smaller than the half width of the X-ray rocking curve of the base layer 110.
- the micropipe density of the substrate 120 is preferably smaller than the micropipe density of the base layer 110.
- the threading screw dislocation density of the substrate 120 is preferably smaller than the threading screw dislocation density of the base layer 110.
- the threading edge dislocation density of the substrate 120 is preferably smaller than the threading edge dislocation density of the base layer 110.
- the basal plane dislocation density of the substrate 120 is preferably smaller than the basal plane dislocation density of the base layer 110.
- the mixed dislocation density of the substrate 120 is preferably smaller than the mixed dislocation density of the base layer 110.
- the stacking fault density of the substrate 120 is preferably smaller than the stacking fault density of the base layer 110.
- the point defect density of the substrate 120 is preferably smaller than the point defect density of the base layer 110.
- the substrate 120 in which the defect density such as the micropipe density, the threading screw dislocation density, the threading edge dislocation density, the basal plane dislocation density, the mixed dislocation density, the stacking fault density, and the point defect density is reduced as compared with the base layer 110. Therefore, a high-quality active layer (epitaxial growth layer) can be formed on the substrate 120.
- a substrate preparation step is performed as step S110.
- substrate 120 and base substrate 110 made of, for example, single crystal SiC are prepared.
- the processing damage layer on the back surface 120B of the substrate 120 is removed similarly to the back surface 2B (FIGS. 6 and 7) of the substrate 2.
- the plane orientation of the main surface 120A of the substrate 120 is selected in accordance with the plane orientation of the desired main surface.
- a substrate 120 whose main surface is a (0-33-8) plane is prepared.
- the base layer 110 for example, a substrate having an impurity concentration higher than 2 ⁇ 10 19 cm ⁇ 3 is employed.
- the substrate 120 for example, a substrate having an impurity concentration larger than 5 ⁇ 10 18 cm ⁇ 3 and smaller than 2 ⁇ 10 19 cm ⁇ 3 is employed.
- step S120 a substrate flattening step is performed as step S120.
- This step is not an essential step, but can be performed when the flatness of the base layer 110 and the substrate 120 prepared in step S110 is insufficient. Specifically, for example, the main surface of the base layer 110 or the substrate 120 is polished. On the other hand, the manufacturing cost can be reduced by omitting this step.
- step S130 a stacking step is performed as step S130. Specifically, as shown in FIG. 13, base layer 110 and substrate 120 are stacked such that main surface 110 ⁇ / b> A of base layer 110 and back surface 120 ⁇ / b> B of substrate 120 are in contact with each other.
- step S140 a joining step is performed as step S140. Specifically, base layer 110 and substrate 120 stacked on each other are heated, for example, to a temperature range equal to or higher than the sublimation temperature of SiC, whereby base layer 110 and substrate 120 are joined. Thereby, the composite substrate 2Xa (FIG. 13) is obtained. In the semiconductor device manufacturing method in the present embodiment, this composite substrate 2Xa is used, and the semiconductor device 1 is manufactured in the same manner as in the first embodiment.
- the heating temperature of the laminated substrate in step S140 is preferably 1800 ° C. or higher and 2500 ° C. or lower.
- the heating temperature is lower than 1800 ° C., it takes a long time to join the base layer 110 and the substrate 120, and the manufacturing efficiency of the composite substrate 2Xa decreases.
- the heating temperature exceeds 2500 ° C., the surfaces of the base layer 110 and the substrate 120 are rough, and there is a risk that defects will be generated in the composite substrate 2Xa to be manufactured.
- the heating temperature of the laminated substrate in step S140 is preferably 1900 ° C. or higher and 2100 ° C. or lower.
- the pressure of the atmosphere during heating in step S140 is 10 ⁇ 5 Pa to 10 6 Pa, more preferably 10 ⁇ 2 Pa to 10 4 Pa, and still more preferably 10 ⁇ 1 Pa to 10 4 Pa.
- the atmosphere at the time of heating in step S140 may be an atmosphere obtained by reducing the atmospheric pressure.
- the atmosphere may be an inert gas atmosphere.
- the atmosphere is preferably an inert gas atmosphere including at least one selected from the group consisting of argon, helium and nitrogen.
- Embodiment 3 Another manufacturing method of the composite substrate (FIG. 13: Embodiment 2) constituting the semiconductor device will be described with reference to FIGS.
- the method for manufacturing a composite substrate in the third embodiment is basically performed in the same manner as in the second embodiment. However, the method for manufacturing the composite substrate in the third embodiment is different from that in the second embodiment in the formation process of the base layer 110.
- a substrate preparation step is first performed as step S110. Specifically, as shown in FIG. 16, a substrate 120 is prepared in the same manner as in the second embodiment, and a raw material substrate 111 made of SiC is prepared.
- This raw material substrate 111 may be made of single crystal SiC, may be made of polycrystalline SiC, or may be a sintered body of SiC. Moreover, it can replace with the raw material substrate 111, and can also employ
- a proximity placement step is performed as step S150. Specifically, as shown in FIG. 16, the substrate 120 and the raw material substrate 111 are held by the first heater 181 and the second heater 182 arranged so as to face each other. At this time, the substrate 120 and the raw material substrate 111 are arranged close to each other so that the main surface 120B and the main surface 111A as the main surfaces face each other with an interval of 1 ⁇ m or more and 1 cm or less, for example, an interval of about 1 mm.
- step S160 a sublimation step is performed as step S160.
- the first heater 181 heats the substrate 120 to a predetermined substrate temperature.
- the raw material substrate 111 is heated to a predetermined raw material temperature by the second heater 182.
- SiC is sublimated from the surface of raw material substrate 111 by heating raw material substrate 111 to the raw material temperature.
- the substrate temperature is set lower than the raw material temperature. Specifically, for example, the substrate temperature is set to be 1 ° C. or more and 100 ° C. or less lower than the raw material temperature.
- the substrate temperature is, for example, 1800 ° C. or higher and 2500 ° C. or lower.
- step S160 is completed, and the substrate 2 shown in FIG. 13 is completed.
- the pressure of the atmosphere used in step S160 is preferably 10 ⁇ 5 Pa to 10 6 Pa, more preferably 10 ⁇ 2 Pa to 10 4 Pa, and still more preferably 10 ⁇ 1 Pa to 10 4 Pa. .
- this atmosphere may be obtained by reducing the atmospheric pressure.
- the atmosphere may be an inert gas atmosphere.
- the atmosphere is preferably an inert gas atmosphere including at least one selected from the group consisting of argon, helium and nitrogen.
- the semiconductor device in the present embodiment basically has the same structure as in the second or third embodiment. However, the composite substrate prepared in the manufacturing process of the semiconductor device of the fourth embodiment is different from the composite substrate of the second or third embodiment.
- composite substrate 2Xb prepared in the method for manufacturing a semiconductor device in the fourth embodiment has a plurality of substrates 120, and each of the plurality of substrates 120 is arranged on base layer 110.
- the plurality of substrates 120 are arranged in a matrix so that the adjacent substrates 120 on the base layer 110 are in contact with each other.
- the composite substrate 2Xb is handled as a large-diameter substrate having a plurality of high-quality substrates 120 in the manufacturing process of the semiconductor device, thereby making the manufacturing process of the semiconductor device more efficient.
- a plurality of substrates 120 are arranged in a plane on the base layer 110 in step S130 in the second embodiment (see FIG. 13), or in step S150 in the third embodiment. Then, by holding the plurality of substrates 120 in a state of being arranged in a plane on the first heater 181 (see FIG. 16), it can be manufactured in the same manner as in the second embodiment or the third embodiment.
- the shortest distance between the plurality of substrates 120 is 5 mm or less, more preferably 1 mm or less, and even more preferably 100 ⁇ m or less. More preferably, it is 10 ⁇ m or less.
- the semiconductor device of the present embodiment is the same as the semiconductor device of the second or third embodiment.
- the semiconductor device in the present embodiment has basically the same structure as that of the semiconductor device in the second embodiment and has the same effects.
- the semiconductor device of the fifth embodiment is different from that of the second embodiment in the structure of the composite substrate.
- amorphous SiC layer 140 as an intermediate layer made of amorphous SiC is arranged between base layer 110 and substrate 120.
- Base layer 110 and substrate 120 are connected by amorphous SiC layer 140. Due to the presence of amorphous SiC layer 140, for example, base layer 110 and substrate 120 having different impurity concentrations can be easily connected.
- step S110 a substrate preparation step is performed as step S110 in the same manner as in the second embodiment, and base layer 110 and substrate 120 are prepared.
- a Si layer forming step is performed as step S111.
- a Si layer having a thickness of, for example, about 100 nm is formed on one main surface of the base layer 110 prepared in step S110.
- the Si layer can be formed by, for example, a sputtering method.
- step S130 a stacking step is performed as step S130.
- the substrate 120 prepared in step S110 is placed on the Si layer formed in step S111. Thereby, a laminated substrate in which the substrate 120 is laminated on the base layer 110 with the Si layer interposed therebetween is obtained.
- step S170 a heating step is performed as step S170.
- the laminated substrate produced in step S130 is heated to about 1500 ° C. in a mixed gas atmosphere of hydrogen gas and propane gas having a pressure of 1 ⁇ 10 3 Pa, for example, and held for about 3 hours.
- carbon is supplied to the Si layer mainly by diffusion from the base layer 110 and the substrate 120, and an amorphous SiC layer 140 is formed as shown in FIG.
- composite substrate 2Xc in the fifth embodiment in which base layer 110 and substrate 120 having different impurity concentrations are connected by amorphous SiC layer 140 can be easily manufactured.
- ohmic contact layer as an intermediate layer formed by siliciding at least part of the metal layer between base layer 110 and substrate 120. This is different from the second embodiment in that 150 is formed.
- the base layer 110 and the substrate 120 are connected by this ohmic contact layer 150. Due to the presence of the ohmic contact layer 150, for example, the composite substrate 2Xd having a configuration in which the base layer 110 and the substrate 120 having different impurity concentrations are stacked can be easily manufactured.
- a substrate preparation step is performed as step S110 in the same manner as in the second embodiment, whereby base layer 110 and substrate 120 are prepared.
- a metal film forming step is performed as step S112.
- a metal film is formed, for example, by vapor-depositing a metal on one main surface of the base layer 110 prepared in the step S110.
- This metal film contains, for example, at least one selected from metals that form silicide when heated, for example, nickel, molybdenum, titanium, aluminum, and tungsten.
- step S130 a stacking step is performed as step S130.
- the substrate 120 prepared in step S110 is placed on the metal film formed in step S112. Thereby, a laminated substrate in which the substrate 120 is laminated on the base layer 110 with the metal film interposed therebetween is obtained.
- step S170 a heating step is performed as step S170.
- the laminated substrate produced in step S130 is heated to about 1000 ° C. in an inert gas atmosphere such as argon.
- an inert gas atmosphere such as argon.
- the metal film a region in contact with the base layer 110 and a region in contact with the SiC substrate
- an ohmic contact layer 150 in ohmic contact with the base layer 110 and the substrate 120 is formed.
- the composite substrate 2Xd having a configuration in which the base layer 110 and the substrate 120 having different impurity concentrations are connected by the ohmic contact layer 150 can be easily manufactured.
- step S110 is first performed in the same manner as in the second embodiment, and then step S120 is performed in the same manner as in the second embodiment as necessary.
- step S125 an adhesive application step is performed as step S125.
- a carbon adhesive is applied onto the main surface of the base layer 110, whereby the precursor layer 161 is formed.
- a carbon adhesive what consists of resin, graphite fine particles, and a solvent can be employ
- the resin a resin that becomes non-graphitizable carbon when heated, such as a phenol resin, can be employed.
- the solvent for example, phenol, formaldehyde, ethanol, or the like can be used.
- the coating amount of the carbon adhesive is preferably 10 mg / cm 2 or more and 40 mg / cm 2 or less, and more preferably 20 mg / cm 2 or more and 30 mg / cm 2 or less.
- the thickness of the carbon adhesive to be applied is preferably 100 ⁇ m or less, and more preferably 50 ⁇ m or less.
- step S130 a stacking step is performed as step S130.
- substrate 120 is placed so as to be in contact with precursor layer 161 formed in contact with the main surface of base layer 110, and a laminated substrate is manufactured. .
- a pre-baking step is performed as step S180.
- the laminated substrate is heated, whereby the solvent component is removed from the carbon adhesive constituting the precursor layer 161.
- the multilayer substrate is gradually heated to a temperature range exceeding the boiling point of the solvent component while applying a load to the multilayer substrate in the thickness direction. This heating is preferably performed while the base layer 110 and the substrate 120 are pressure-bonded using a clamp or the like. Further, by performing pre-baking (heating) as much as possible, degassing from the adhesive proceeds, and the strength of bonding can be improved.
- step S190 a firing step is performed as step S190.
- the laminated substrate heated in step S180 and pre-baked with the precursor layer 161 is heated to a high temperature, preferably 900 ° C. to 1100 ° C., for example 1000 ° C., preferably 10 minutes to 10 hours, for example,
- the precursor layer 161 is baked by being held for 1 hour.
- an atmosphere at the time of firing an inert gas atmosphere such as argon is adopted, and the pressure of the atmosphere can be set to atmospheric pressure, for example. Thereby, the precursor layer 161 becomes the carbon layer 160 made of carbon.
- the composite substrate 2Xe (FIG. 24) having a configuration in which the base layer 10 and the SiC substrate SiC layer) 20 are joined by the carbon layer 160 is obtained.
- the MOSFET has been described.
- the semiconductor device of the present invention is not limited to this, and may be another type of semiconductor device such as an IGBT (Insulated Gate Bipolar Transistor).
- IGBT Insulated Gate Bipolar Transistor
- the semiconductor device of the present invention is not limited to such a configuration, and is a semiconductor device including a configuration having a Schottky junction, for example. May be.
- SYMBOLS 1 Semiconductor device 2,120 Substrate, 2A, 120A Main surface (first surface), 2B, 120B Back surface (second surface), 2p processing damage layer, 2Z ingot, 10 gate electrode, 11 source electrode, 12 drain Electrode, 21 buffer layer, 22 breakdown voltage holding layer, 23 p region, 24 n + region, 25 p + region, 26 oxide film (insulating film), 27 upper source electrode, 110 base layer, 140 amorphous SiC layer, 150 ohmic contact Layer, 160 carbon layer, 161 precursor layer, 181 first heater, 182 second heater.
Abstract
Description
図1を参照して、本実施の形態における半導体装置1は、縦方向に電流経路を有するものであって、具体的には縦型DiMOSFET(Double Implanted MOSFET)である。半導体装置1は、基板2、バッファ層21、耐圧保持層22、p領域23、n+領域24、p+領域25、酸化膜26、ソース電極11および上部ソース電極27、ゲート電極10および基板2の裏面側に形成されたドレイン電極12を備える。バッファ層21、耐圧保持層22、p領域23、n+領域24、およびp+領域25は、基板2上において炭化珪素から作られた半導体層を構成しており、この半導体層は上部ソース電極27およびドレイン電極12の間で半導体装置1の電流経路を構成している。
はじめに、炭化珪素基板準備工程S10(図3)を実施する。この工程では、面方位(0-33-8)面を主表面2Aとする導電型がn型の炭化珪素基板を基板2として準備する。このような基板は、たとえば(0001)面を主表面とするインゴット(原料結晶)から(0-33-8)面が主表面2Aとして露出するように基板を切出すといった手法により得ることができる。また基板2としては、たとえば導電型がn型であり、基板抵抗が0.02Ωcmといった基板を用いてもよい。具体的には、以下の図4~図7に示す工程が行われる。
図13を参照して、本実施の形態における半導体装置は、上記実施の形態1における半導体装置1(図1)の基板2の代わりに複合基板2Xaを有する。複合基板2Xaは、SiCからなるベース層110と、ベース層110の一方の主表面110A上に配置された基板120とを含んでいる。基板120は、基板2(図7:実施の形態1)と同様の構成を有しており、基板2の主表面2Aに対応する主表面120Aと、基板2の裏面に対応する裏面120Bとを有する。なお本実施の形態においてはドレイン電極12は裏面120B上にベース層110を介して設けられる。またベース層110と基板120とは、別の結晶からなっている。そして、基板120の欠陥密度はベース層110の欠陥密度よりも小さい。
図14を参照して、まず工程S110として基板準備工程が実施される。この工程では、図13を参照して、基板120と、たとえば単結晶SiCからなるベース基板110とが準備される。基板120の裏面120B上の加工ダメージ層は、基板2の裏面2B(図6および図7)と同様に除去される。
半導体装置を構成する複合基板(図13:実施の形態2)の他の製造方法について、図15~図18を参照して説明する。実施の形態3における複合基板の製造方法は、基本的には上記実施の形態2の場合と同様に実施される。しかし、実施の形態3における複合基板の製造方法は、ベース層110の形成プロセスにおいて実施の形態2の場合とは異なっている。
本実施の形態における半導体装置は、基本的には実施の形態2または3と同様の構造を有している。しかし、実施の形態4の半導体装置の製造工程において準備される複合基板は、実施の形態2または3の複合基板と異なっている。
複合基板のさらに他の製造方法について説明する。本実施の形態における半導体装置は、基本的には実施の形態2における半導体装置と同様の構造を有し、同様の効果を奏する。しかし、実施の形態5の半導体装置は、複合基板の構造において実施の形態2の場合とは異なっている。
図21を参照して、まず工程S110として基板準備工程が実施の形態2の場合と同様に実施され、ベース層110と基板120とが準備される。
図22を参照して、本実施の形態における複合基板2Xdにおいては、ベース層110と基板120との間に、金属層の少なくとも一部がシリサイド化されて形成された中間層としてのオーミックコンタクト層150が形成されている点において、実施の形態2の場合とは異なっている。そして、ベース層110と基板120とは、このオーミックコンタクト層150により接続されている。このオーミックコンタクト層150の存在により、たとえば不純物濃度の異なるベース層110と基板120とを積層した構成を有する複合基板2Xdを容易に作製することができる。
図23を参照して、まず工程S110として基板準備工程が実施の形態2の場合と同様に実施され、ベース層110と基板120とが準備される。
図24を参照して、本実施の形態における複合基板2Xeにおいては、ベース層110と基板120との間に中間層としてのカーボン層160が形成されている点において、実施の形態2の場合とは異なっている。そして、ベース層110と基板120とは、このカーボン層160により接続されている。このカーボン層160の存在により、たとえば不純物濃度の異なるベース層110と基板120とを積層した構成を有する複合基板2Xeを容易に作製することができる。
図25を参照して、まず工程S110が実施の形態2と同様に実施された後、必要に応じて工程S120が実施の形態2と同様に実施される。
Claims (21)
- 電流経路を有する半導体装置(1)であって、
前記電流経路の少なくとも一部を構成し、かつ炭化珪素から作られた半導体層(21~25)と、
前記半導体層を支持する第1の面(2A)と前記第1の面に対向する第2の面(2B)とを有し、かつ4H型の単結晶構造を有する炭化珪素から作られ、かつフォトルミネッセンス測定において波長390nm付近のピーク強度に対する波長500nm付近のピーク強度の比が0.1以下となる物性を有する基板(2)とを備える、半導体装置。 - 前記基板は前記第2の面において前記物性を有する、請求項1に記載の半導体装置。
- 前記半導体層上に絶縁膜(26)をさらに備えた、請求項1に記載の半導体装置。
- 前記絶縁膜は前記半導体層の材料の酸化物から作られている、請求項3に記載の半導体装置。
- 前記絶縁膜は熱酸化膜である、請求項3に記載の半導体装置。
- 前記基板は前記電流経路の一部を構成する、請求項1に記載の半導体装置。
- 前記第1の面は{0001}面に対して50°以上65°以下のオフ角を有する、請求項1に記載の半導体装置。
- 前記オフ角のオフ方位は<11-20>方向に対して±5°以下の範囲内にある、請求項7に記載の半導体装置。
- 前記オフ角のオフ方位は<01-10>方向に対して±5°以下の範囲内にある、請求項7に記載の半導体装置。
- 前記第1の面は<01-10>方向において{03-38}面に対して-3°以上+5°以下のオフ角を有する、請求項9に記載の半導体装置。
- 前記第1の面は<01-10>方向において(0-33-8)面に対して-3°以上+5°以下のオフ角を有する、請求項10に記載の半導体装置。
- 前記基板を支持し、かつ炭化珪素から作られたベース層(110)をさらに備える、請求項1に記載の半導体装置。
- 電流経路を有する半導体装置(1)の製造方法であって、
第1の面(2A)と、前記第1の面に対向する第2の面(2B)とを有し、かつ4H型の単結晶構造を有する炭化珪素から作られた基板(2)を準備する工程を備え、前記基板を準備する工程において前記第2の面上に加工ダメージ層(2p)が形成され、さらに
前記第2の面上における前記加工ダメージ層を除去する工程と、
前記第1の面上に、前記電流経路の少なくとも一部を構成し、かつ炭化珪素から作られた半導体層(21~25)を形成する工程と、
前記加工ダメージ層を除去する工程の後に、前記基板および前記半導体層を加熱する工程とを備える、半導体装置の製造方法。 - 前記基板および前記半導体層を加熱する工程は、前記半導体層の表面を熱酸化することによって前記半導体層上に絶縁膜(26)を形成する工程を含む、請求項13に記載の半導体装置の製造方法。
- 前記基板を準備する工程は、
4H型の単結晶構造を有する炭化珪素から作られたインゴット(2Z)を準備する工程と、
前記インゴットをスライスすることによって前記第2の面を形成する工程とを含む、請求項13に記載の半導体装置の製造方法。 - 前記半導体層を形成する工程の前に、前記第1の面を研磨する工程をさらに備える、請求項13に記載の半導体装置の製造方法。
- 前記加工ダメージ層を除去する工程の後、かつ前記半導体層を形成する工程の前に、前記第2の面上に炭化珪素から作られたベース層(110)を形成する工程をさらに備える、請求項13に記載の半導体装置の製造方法。
- 前記加工ダメージ層を除去する工程は、溶融KOHエッチングによって前記加工ダメージ層を除去する工程を含む、請求項13に記載の半導体装置の製造方法。
- 前記加工ダメージ層を除去する工程は、ドライエッチングによって前記加工ダメージ層を除去する工程を含む、請求項13に記載の半導体装置の製造方法。
- 前記加工ダメージ層を除去する工程は、前記加工ダメージ層を昇華させる工程を含む、請求項13に記載の半導体装置の製造方法。
- 前記加工ダメージ層を除去する工程は、研磨によって前記加工ダメージ層を除去する工程を含む、請求項13に記載の半導体装置の製造方法。
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- 2010-12-20 CA CA2793969A patent/CA2793969A1/en not_active Abandoned
- 2010-12-20 EP EP10848496.5A patent/EP2551891B1/en active Active
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150303266A1 (en) * | 2012-12-18 | 2015-10-22 | Sumitomo Electric Industries, Ltd. | Silicon carbide semiconductor device |
US9647072B2 (en) * | 2012-12-18 | 2017-05-09 | Sumitomo Electric Industries, Ltd. | Silicon carbide semiconductor device |
Also Published As
Publication number | Publication date |
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TW201140834A (en) | 2011-11-16 |
JPWO2011118104A1 (ja) | 2013-07-04 |
US10741683B2 (en) | 2020-08-11 |
EP2551891B1 (en) | 2021-09-01 |
KR20130006442A (ko) | 2013-01-16 |
JP6218773B2 (ja) | 2017-10-25 |
JP2015159316A (ja) | 2015-09-03 |
CN105789029B (zh) | 2018-08-31 |
JP5737281B2 (ja) | 2015-06-17 |
US9947782B2 (en) | 2018-04-17 |
CA2793969A1 (en) | 2011-09-29 |
US20180204942A1 (en) | 2018-07-19 |
CN102812537A (zh) | 2012-12-05 |
EP2551891A1 (en) | 2013-01-30 |
DE202010018325U1 (de) | 2015-08-18 |
EP2551891A4 (en) | 2014-07-02 |
US20130009171A1 (en) | 2013-01-10 |
CN102812537B (zh) | 2016-03-16 |
CN105789029A (zh) | 2016-07-20 |
EP3869537A1 (en) | 2021-08-25 |
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